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Reviews

Asus ZenFone 4 Review: Hidden gem

Asus ZenFone 4 in hand

The Pros

  • Excellent camera experience
  • Up to 36 hours of battery life
  • Reliable performance

The Cons

  • Slightly outdated design
  • Somewhat bloated Android skin
  • Camera occasionally goes overboard with processing

Asus may not be a major brand name in mobile, but what it’s bringing to the mid-range smartphone market shouldn’t go unrecognized.

Over the past few generations of ZenFone smartphones, the company has consistently nailed the camera experience, releasing cameras with great low-light shooting and quick autofocus.

What’s more, Asus’ mid-range smartphones have routinely wowed me when it comes to battery life.

Asus ZenFone 4

Asus ZenFone 4 Pro

Display

5.5-inch Super IPS display, 1080 x 1920 pixels

5.5-inch AMOLED display, 1080 x 1920 pixels

Processor

Octa-core Qualcomm Snapdragon 630

Octa-core Qualcomm Snapdragon 835

RAM

4GB

6GB

Storage

64GB (supports up to 2TB)

64GB (supports up to 2TB)

Dimensions (in.)

75.2 x 155.4 x 7.5mm

156.9 x 75.6 x 7.6mm

Weight

165g

175g

Rear Facing Camera

12-megapixel (f/1.8 aperture, LED Flash) + 8-megapixel (120-degree wide-angle)

12-megapixel (f/1.7, OIS, LED Flash) + 16-megapixel (2x optical zoom)

Front Facing Camera

8-megapixel (f/2.0)

8-megapixel (f/1.9)

OS

Android 7.1.1 Nougat

Android 7.1.1 Nougat

Battery

3300mAh (non removable)

3600mAh (non removable)

Network Connectivity

GSM / HSPA / LTE

GSM / HSPA / LTE

Sensors

Fingerprint, accelerometer, gyro, proximity, compass, ambient light sensor, Hall sensor

Fingerprint sensor, barometer, three-axis gyro, accelerometer, proximity sensor

SIM Type

Dual SIM (Nano SIM + Micro SIM)

Nano SIM

Launch Date

October 31, 2017

October 31, 2017

Misc

Colours: Moonlight White, Midnight Black | Asus ZenUI 4.0, Bluetooth 5.0, USB Type-C

Colour: Pure Black | Asus ZenUI 4.0, Bluetooth 5.0, USB Type-C

Display

Asus ZenFone 4

5.5-inch Super IPS display, 1080 x 1920 pixels

Asus ZenFone 4 Pro

5.5-inch AMOLED display, 1080 x 1920 pixels

Processor

Asus ZenFone 4

Octa-core Qualcomm Snapdragon 630

Asus ZenFone 4 Pro

Octa-core Qualcomm Snapdragon 835

RAM

Asus ZenFone 4

4GB

Asus ZenFone 4 Pro

6GB

Storage

Asus ZenFone 4

64GB (supports up to 2TB)

Asus ZenFone 4 Pro

64GB (supports up to 2TB)

Dimensions (in.)

Asus ZenFone 4

75.2 x 155.4 x 7.5mm

Asus ZenFone 4 Pro

156.9 x 75.6 x 7.6mm

Weight

Asus ZenFone 4

165g

Asus ZenFone 4 Pro

175g

Rear Facing Camera

Asus ZenFone 4

12-megapixel (f/1.8 aperture, LED Flash) + 8-megapixel (120-degree wide-angle)

Asus ZenFone 4 Pro

12-megapixel (f/1.7, OIS, LED Flash) + 16-megapixel (2x optical zoom)

Front Facing Camera

Asus ZenFone 4

8-megapixel (f/2.0)

Asus ZenFone 4 Pro

8-megapixel (f/1.9)

OS

Asus ZenFone 4

Android 7.1.1 Nougat

Asus ZenFone 4 Pro

Android 7.1.1 Nougat

Battery

Asus ZenFone 4

3300mAh (non removable)

Asus ZenFone 4 Pro

3600mAh (non removable)

Network Connectivity

Asus ZenFone 4

GSM / HSPA / LTE

Asus ZenFone 4 Pro

GSM / HSPA / LTE

Sensors

Asus ZenFone 4

Fingerprint, accelerometer, gyro, proximity, compass, ambient light sensor, Hall sensor

Asus ZenFone 4 Pro

Fingerprint sensor, barometer, three-axis gyro, accelerometer, proximity sensor

SIM Type

Asus ZenFone 4

Dual SIM (Nano SIM + Micro SIM)

Asus ZenFone 4 Pro

Nano SIM

Launch Date

Asus ZenFone 4

October 31, 2017

Asus ZenFone 4 Pro

October 31, 2017

Misc

Asus ZenFone 4

Colours: Moonlight White, Midnight Black | Asus ZenUI 4.0, Bluetooth 5.0, USB Type-C

Asus ZenFone 4 Pro

Colour: Pure Black | Asus ZenUI 4.0, Bluetooth 5.0, USB Type-C

The ZenFone 4 proudly upholds these traditions, and as a bonus, it looks better than any previous Asus smartphone — even if it continues to be a bit outdated.

Meanwhile, the brand’s ZenFone 4 Pro offers marginal improvements on the strengths of the ZenFone 4, but for most consumers the boost in power won’t be worth the uptick in price.

A new old look

The ZenFone 4 is notably more elegant than last year’s iteration. It features less blocky, harsh lines and no silver accent on the chamfered edges. The Asus logo is subtler, and the dual cameras on the rear sit flush with the back panel. It’s still got a bit of flash through, with a noticeable starburst effect on the rear that adds a unique touch.

Overall, it’s a handsome redesign, but unfortunately, it’s still about a generation behind the times with its 16:9 aspect ratio display and increasingly rare front-facing fingerprint sensor.

Don’t get me wrong — I appreciate the fingerprint sensor and physical navigation buttons. Until fingerprint sensors embedded under displays become commonplace it’s simply the most logical position for small-handed users. But I’ll admit the display lacks the wow factor of an 18:9 aspect ration.

Still, the display is nearly edge-to-edge on the sides, providing a decent amount of real estate. My larger issue is screen dimness. Asus promises 600 nits (close to what the iPhone X can hit), but in reality it appeared much dimmer than that, especially in outdoor light.

As for inputs, the ZenFone 4 features a dual SIM slot, one of which can also be used for microSD expansion. There’s a single, surprisingly powerful bottom-firing speak on the bottom edge of the device and a headphone jack that delivers sound via a high-res audio 192kHz/24-bit standard that Asus says is “four times better than CD quality.”

Though it’s been a while since I’ve experienced CD quality, I will say I was impressed by the clear and well-articulated sound delivered through my B&O Play earbuds.

Reliable performance

As with the ZenFone 3, the ZenFone 4’s performance was, above all, reliable.

Running on the octa-core Snapdragon 630 chipset with 4GB of RAM, the device is no mobile gaming powerhouse, but is consistently zippy for most everyday multi-tasking needs.

In fact, while load times for games were occasionally on the long side, the phone never featured noticeable lag, and I experienced no random app shutdowns during my several weeks with the phone.

On top of that, even when demanding a fair amount from it — over an hour of Netflix streaming or mobile gaming, for instance — the handset didn’t overheat. It got a bit warm, but wasn’t at all uncomfortable to hold and never surpassed 40 degrees Celsius.

In the storage department, the ZenFone 4 includes a 64GB base expandable by microSD and comes with 100GB of free Google Drive space for one year, regularly $2.79 CAD per month.

As for connectivity, the ZenFone 4 does not support Band 66, which makes it less than ideal for use on Freedom Mobile’s network. The phone will work on the bands used by Canada’s major LTE networks though.

Its modem features Category 12 upload speeds of up to 150Mbps and Category 13 download speeds of up to 600Mbps — though real-world speeds are much lower.

Meanwhile, the ZenFone 4’s premium sibling, the ZenFone 4 Pro, runs on the Qualcomm Snapdragon 835 (which stocks the X16 modem capable of 1Gbps peak download speeds) and 6GB of RAM. This chipset and RAM combo powers up the device for gamers and anyone downloading significant amounts of content.

A camera setup that wows

Camera performance is hands-down what impresses me most about Asus’ ZenFones.

With the ZenFone 4 and ZenFone 4 Pro, I was particularly impressed by the beautiful colour saturation of the images, the quickness and lack of blur in action shot capture and the light capture in low-light shooting.

Both devices have dual camera set-ups. The ZenFone 4 has a 12-megapixel shooter with a f/1.8 aperture and an 8-megapixel shooter with 120-degree wide-angle capture. The ZenFone 4 Pro steps it up with a 12-megapixel shooter with a f/1.7 aperture and 16-megapixel shooter with 2x optical zoom.

Like Sony, it’s clear that Asus leans on software to do a fair amount of the work in producing gorgeous snaps, but it manages to do so in a generally less obtrusive way. I found fewer examples of over-sharpening and resulting artifacts marring the photo.

However, you can sometimes see evidence of over-processing with a bizarre ghost-like effect. This was more often the case, in my experience, with the ZenFone 4 Pro, though I also managed to get some stunning shots with that device. See examples of both below.

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27901602_10156187478132509_99311986_o
27835762_10156187476802509_422768359_o
27836107_10156187472012509_1390775056_o
27846265_10156187471982509_1747914516_o
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27907126_10156187472007509_1683069066_o
27907152_10156187472052509_716177336_o
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Above: Asus ZenFone 4 Pro sample pictures.

With the ZenFone 4, I found the level of high dynamic range impressive for a mid-range smartphone camera. Rarely does the shooter blow out a bright section of a photo and over-darken another. Photos taken in those stark contrasts are generally equally illuminated throughout, with strong, vibrant colours.

As mentioned above, low light performance is stellar for a phone in its price range. According to Asus, this is partially because it uses the Sony flagship IMX362 12-megapixel dual-pixel image sensor – with a 1.4µm pixel size, compared to the more typical 1.12µm pixel size.

And while it can sometimes be a little slow to launch, the camera setup’s auto-focus and shutter are fast, resulting in generally successful action shots.

27946158_10156187475737509_1073571534_o
27946727_10156187477112509_106364200_o
27846402_10156187475442509_1211280300_o
27846512_10156187477762509_1574351419_o
27901602_10156187478132509_99311986_o
27835762_10156187476802509_422768359_o
27836107_10156187472012509_1390775056_o
27846265_10156187471982509_1747914516_o
27906700_10156187471992509_1590655509_o
27907126_10156187472007509_1683069066_o
27907152_10156187472052509_716177336_o
27906516_10156188224342509_1879004151_o

Above: Asus ZenFone 4 sample pictures.

One of the key differences between the ZenFone 4 and ZenFone 4 Pro’s camera setups is that the latter uses its dual-camera system for wide-angle shots, while the Pro uses it for 2x optical zoom. Personally, I find the wide-angle feature more useful, as it allows you to squeeze more into any given shot.

As for other interesting camera features, the ZenFone 4 can save pictures in RAW in pro mode, which is useful for professional editing. The camera also features a GIF animation mode, time lapse feature and can record 4K UHD video at 30 frames-per-second.

The selfie camera has an 84-degree field of view and takes adequately sharp and well-saturated pictures.

Up to two-day battery life

One of the main reasons to love a good mid-range device is multi-day battery life and the ZenFone 4 comes through on this — at least with medium usage.

The times where I’ve managed to eke out around 36 hours of battery life have been moderate usage days for me. I spent a couple hours each day of music streaming, made a few calls and spent another few hours of social media browsing.

Of course, days where you video chat, play games or stream content will drain the battery a lot faster, but even so, you’ll comfortably get 12 hours of use even with robust usage.

That’s because the 630 chipset is less taxing than, for example, the 835. Plus, the battery is a decent size at 3,300mAh.

As for charging, it takes about an hour and a half to charge to full capacity.

Palatable user experience

One of the things that tends to dissuade people from purchasing lesser known Android brands — whether they admit it or not — is the potentially strange and unintuitive layer of customization, or skin.

There’s no point denying it: Asus’ skin is quite different from the stock version of Android 8.0 that it overlays, and that’s not to its advantage. It lacks many of the useful flourishes of Android on the Google Pixels and features a decent amount of bloatware (there are 20 pre-installed Asus apps ranging from useful to exceedingly pointless).

Still, it’s not much of a hinderance. A bit of uninstalling and downloading of key Google apps like the Google Now Launcher and Gboard make it more than palatable.

Prospective buyers shouldn’t let Asus’ Android skin figure too highly into their purchasing decision – it’s more or less as quirky as any other non-Google Android device.

Main competition and pricing

Asus ZenFone 4

Samsung Galaxy A5 (2017)

Motorola Moto Z2 Play

Display

5.5-inch Super IPS display, 1080 x 1920 pixels

5.2-inch Super AMOLED display, 1080 x 1920 pixels

5.5-inch Super AMOLED, 1080 x 1920 pixels

Processor

Octa-core Qualcomm Snapdragon 630

Exynos 7880

Qualcomm Snapdragon 626

RAM

4GB

3GB

3GB of RAM

Storage

64GB (supports up to 2TB)

32GB (expandable)

32GB (expandable up to 2TB)

Dimensions (in.)

75.2 x 155.4 x 7.5mm

146.1 x 71.4 x 7.9 mm

156.2 x 76.2 x 5.9mm

Weight

165g

157g

145g

Rear Facing Camera

12-megapixel (f/1.8 aperture, LED Flash) + 8-megapixel (120-degree wide-angle)

16-megapixel (f/1.9, LED flash, AF)

12-megapixel (f/1.7), phase detection and laser autofocus, dual-LED (dual tone) flash

Front Facing Camera

8-megapixel (f/2.0)

16-megapixel (f/1.9)

5-megapixel (f/2.2, 1.4 µm), dual-LED (dual tone) flash, 1080p

OS

Android 7.1.1 Nougat

Android 6.0.1 Marshmallow

Android 7.1.1 Nougat

Battery

3300mAh (non removable)

3000mAh (non-removable)

3,000mAh

Network Connectivity

GSM / HSPA / LTE

GSM / HSPA / LTE

GSM/ HSPA / LTE

Sensors

Fingerprint, accelerometer, gyro, proximity, compass, ambient light sensor, Hall sensor

Accelerometer, Proximity, Geomagnetic, RGB Light, Hall, Fingerprint scanner, Barometer

Fingerprint (front-mounted), accelerometer, gyro, proximity, compass

SIM Type

Dual SIM (Nano SIM + Micro SIM)

Nano SIM

Nano SIM

Launch Date

October 31, 2017

March 17, 2017

June 1, 2017

Misc

Colours: Moonlight White, Midnight Black | Asus ZenUI 4.0, Bluetooth 5.0, USB Type-C

Colours: Black Sky, Gold Sand, Blue Mist, Peach Cloud | IP68 dust/water resistant, Wi-Fi 802.11 a/b/g/n/ac, Bluetooth v 4.2, ANT+, USB Type-C, NFC (UICC, eSE)

Modular, Bluetooth 4.2, USB 3.1, water repellent nano-coating

Display

Asus ZenFone 4

5.5-inch Super IPS display, 1080 x 1920 pixels

Samsung Galaxy A5 (2017)

5.2-inch Super AMOLED display, 1080 x 1920 pixels

Motorola Moto Z2 Play

5.5-inch Super AMOLED, 1080 x 1920 pixels

Processor

Asus ZenFone 4

Octa-core Qualcomm Snapdragon 630

Samsung Galaxy A5 (2017)

Exynos 7880

Motorola Moto Z2 Play

Qualcomm Snapdragon 626

RAM

Asus ZenFone 4

4GB

Samsung Galaxy A5 (2017)

3GB

Motorola Moto Z2 Play

3GB of RAM

Storage

Asus ZenFone 4

64GB (supports up to 2TB)

Samsung Galaxy A5 (2017)

32GB (expandable)

Motorola Moto Z2 Play

32GB (expandable up to 2TB)

Dimensions (in.)

Asus ZenFone 4

75.2 x 155.4 x 7.5mm

Samsung Galaxy A5 (2017)

146.1 x 71.4 x 7.9 mm

Motorola Moto Z2 Play

156.2 x 76.2 x 5.9mm

Weight

Asus ZenFone 4

165g

Samsung Galaxy A5 (2017)

157g

Motorola Moto Z2 Play

145g

Rear Facing Camera

Asus ZenFone 4

12-megapixel (f/1.8 aperture, LED Flash) + 8-megapixel (120-degree wide-angle)

Samsung Galaxy A5 (2017)

16-megapixel (f/1.9, LED flash, AF)

Motorola Moto Z2 Play

12-megapixel (f/1.7), phase detection and laser autofocus, dual-LED (dual tone) flash

Front Facing Camera

Asus ZenFone 4

8-megapixel (f/2.0)

Samsung Galaxy A5 (2017)

16-megapixel (f/1.9)

Motorola Moto Z2 Play

5-megapixel (f/2.2, 1.4 µm), dual-LED (dual tone) flash, 1080p

OS

Asus ZenFone 4

Android 7.1.1 Nougat

Samsung Galaxy A5 (2017)

Android 6.0.1 Marshmallow

Motorola Moto Z2 Play

Android 7.1.1 Nougat

Battery

Asus ZenFone 4

3300mAh (non removable)

Samsung Galaxy A5 (2017)

3000mAh (non-removable)

Motorola Moto Z2 Play

3,000mAh

Network Connectivity

Asus ZenFone 4

GSM / HSPA / LTE

Samsung Galaxy A5 (2017)

GSM / HSPA / LTE

Motorola Moto Z2 Play

GSM/ HSPA / LTE

Sensors

Asus ZenFone 4

Fingerprint, accelerometer, gyro, proximity, compass, ambient light sensor, Hall sensor

Samsung Galaxy A5 (2017)

Accelerometer, Proximity, Geomagnetic, RGB Light, Hall, Fingerprint scanner, Barometer

Motorola Moto Z2 Play

Fingerprint (front-mounted), accelerometer, gyro, proximity, compass

SIM Type

Asus ZenFone 4

Dual SIM (Nano SIM + Micro SIM)

Samsung Galaxy A5 (2017)

Nano SIM

Motorola Moto Z2 Play

Nano SIM

Launch Date

Asus ZenFone 4

October 31, 2017

Samsung Galaxy A5 (2017)

March 17, 2017

Motorola Moto Z2 Play

June 1, 2017

Misc

Asus ZenFone 4

Colours: Moonlight White, Midnight Black | Asus ZenUI 4.0, Bluetooth 5.0, USB Type-C

Samsung Galaxy A5 (2017)

Colours: Black Sky, Gold Sand, Blue Mist, Peach Cloud | IP68 dust/water resistant, Wi-Fi 802.11 a/b/g/n/ac, Bluetooth v 4.2, ANT+, USB Type-C, NFC (UICC, eSE)

Motorola Moto Z2 Play

Modular, Bluetooth 4.2, USB 3.1, water repellent nano-coating

At $550 CAD, the ZenFone 4 is solidly mid-range, occupying an increasingly shrinking area of the overall market. Perhaps one of its main competitors in the bracket — due mostly to carrier support — is the Samsung A5 (2017), which can be purchased outright for $470.

Samsung devices are known for strong camera performance, particularly in low light, and reliably zippy processing. In my experience with the device, I also noted its attractive, waterproof design and vibrant Super AMOLED display.

In pretty much all aspects, however, the newer ZenFone 4 is more impressive. The A5 features 3GB of RAM, 32GB of base storage, only one 16-megapixel camera, a 3,000mAh battery and it’s currently running Android 7.0.

The modular Moto Z2 Play is also a competitor, but costs between $700$ and $800 at carriers and has outdated specs compared to the ZenFone 4.

Other devices that may attract the same base and can be purchased online include the OnePlus 5 and 5T – premium devices with a close-to-premium price point, and the ZTE Axon 7, which is $500 but now end-of-life (the Axon 8 has yet to be announced). The Axon 7 features the Snapdragon 820 and 4GB of RAM.

As for comparing it against its premium sibling, the Asus ZenFone 4 Pro, unless you’re an avid mobile gamer there’s not much of an argument to be made for the Pro. At $900 outright, it costs $350 more than the ZenFone 4, but doesn’t have an updated design and features a camera that’s impressive, but sometimes not reliable.

A worthy deal

The ZenFone 4 marks yet another quality addition to Asus’s ZenFone line. While its lack of carrier support may mean it’s destined to remain an obscure brand for most consumers, those seeking quality inexpensive options online would do well to consider this handset.

I was sincerely impressed by its camera performance, battery life and reliability. At $550, it’s a steal.

"I was sincerely impressed by its camera performance, battery life and reliability."

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